STEP 1. Using scan tool (M.U.T.-IIISE), read the ETACS-ECU diagnostic trouble code
STEP 2. Resistance measurement at the column switch connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the column switch connector (GND terminal) and the ground.OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 4. Go to Step 3.
STEP 3. Check of open circuit in GND line between column switch connector and ground.
STEP 4. Voltage measurement at the column switch connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the voltage between the column switch connector (+B terminal) and the ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 6. Go to Step 5.
STEP 5. Check of short to ground, and open circuit in +B line between ETACS-ECU connector and column switch connector.
STEP 6. Check of open circuit in DATA line between ETACS-ECU connector and column switch connector.
STEP 7. Recheck the DTC.
Check again if the DTC is set in the ETACS-ECU.(1) caution | To prevent damage to scan tool (M.U.T.-IIISE), always turn the electric motor switch to the OFF before connecting or disconnecting scan tool (M.U.T.-IIISE). |
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE)
."
(2) Erase the DTC.
(3) Turn the power supply mode of the electric motor switch from OFF to ON.
(4) Check if the DTC is set.
Is DTC set?
Replace the column switch. A poor connection, open circuit, or other intermittent malfunctions in the LIN bus lines between the column switch and the ETACS-ECU (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).